alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Glupteba CnC Domain (checkpos .net in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".checkpos.net"; endswith; fast_pattern; reference:url,www.nozominetworks.com/blog/tracking-malicious-glupteba-activity-through-the-blockchain/; classtype:domain-c2; sid:2043040; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_12_28, deployment Perimeter, malware_family Glupteba, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_28, reviewed_at 2023_12_12, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)